You're right
@shadow_priest_x in there's no way Eddie Furlong will get cast.
But let me try something here:
John Connor literally has the weight of the entire world on his shoulders; he was told from a young age the machines will rise and end mankind and he is literally the saviour.
What do you think that would do to a person really? All that pressure, all that expectation. What do you think it would do to a big momma's boy?
You'd crack, you'd crumble under the pressure, the burden of this. You'd self destruct, become a self loathing, self doubting mess.
And you'd end up like this
It could be a story of JC's redemption and living up to being the saviour of mankind.
So Furlong could start the movie looking like the tub of crap he looks here, but redeem himself and fulfill his destiny and become awesome.
But still a fat tub of shit.
It's fun to dream